Added pump characteristics that can be called with value of volumetric flow relative to the design point volumetric flow. "Scaling the curve".

git-svn-id: https://thermopower.svn.sourceforge.net/svnroot/thermopower/trunk@197 80daafeb-7430-0410-91d5-8b30b0bbd841
Revised comments on new functions pump characteristics 

git-svn-id: https://thermopower.svn.sourceforge.net/svnroot/thermopower/trunk@198 80daafeb-7430-0410-91d5-8b30b0bbd841